Rotary scaling device



Sept. 13, 1960 o. N. PEDERSEN ROTARY scALING DEVICE Filed Aug. 19, 1959ATTORNEYS.

n 2,952,066 ROTARY scALING DEVICE Olaf Nedland Pedersen, 1100 HaringRoad, Metairie, La. Filed Aug. 19, 1959, Ser. No. 834,691

Claims. (Cl. 29-81) The present invent-ion relates toa rotary scalingdevice for removing rust and paint from surfaces, such as those of aship, prior to repainting.

The primary object of the invention is to provide a rotary scalingdevice which is portable, strong, safe to operate, light of weight, andwhich has the drive motor therefor directly connected thereto.

Another object of the invention is to provide a rotary scaling devicehaving a plurality of universally mounted hammers constructed to permitthe hammers to move outwardly from center under centrifugal force ofrotation ofthe scaling device.

A further object of the invention is to provide a rotary scaling deviceof the class described above lin which the hammers are mounted forrotation on their own axis and can be readily removed from the scalingdevice for repair or replacement as required.

A still further object of the invention is to provide a rotary scalingdevice of the class described above which is inexpensive to manufacture,simple to use and which effectively performs the scaling functiondesired.

Other objects and advantages will become apparent in the followingspecification when considered in light of the attached drawings, inwhich:

Figure 1 is a side elevation of the invention shown partially brokenaway and in section yfor convenience of illustration; and

Figure 2 is an end elevation of the invention from the scaling tool end.

Referring now to the drawings in detail wherein like referencecharacters indicate like parts throughout the several figures, thereference numeral 'y indicates generally a rotary scaling deviceconstructed in accordance with the invention.

The rotary scaling device 10 includes a small electric drill motor 11having a hand grip 12 and a triggeractuated switch 13- controlling theoperation of the motor 11. The motor 11 includes a conventional gear boxand drive to provide the correct drive speed for the scaling device 10.The motor 11 at the end thereof opposite the hand grip 12 is providedwith an externally threaded circular boss 14 through which extends anexternally threaded drive spindle 15. A cylindrical hand grip forminghousing 16 is internally threaded at 17 and is threaded on to theexternally threaded boss 14 to rigidly mount the housing 16 to theelectric motor 11.

A ball bearing, generally indicated at 18, has its outer race 19 seatedin the generally cylindrical housing 16 at the end thereof opposite theinternally threaded portion 17. The housing 16 is internally threaded at20 outwardly of the bearing 18 and an externally threaded locking ring21 is threaded therein to lock the outer race 19 into the housing 16. Astub shaft 22 is concentrically positioned in the housing 16 and has athreaded socket 23 threadably coupled to the threaded spindle 15 of themotor 11. The stub shaft 22 h-as a reduced extension 24 forming ashoulder 25 at the juncture of the stub shaft 22 and the reducedextension 24.

The reduced extension 24 is mounted in the inner race 26 of the bearing18 with the shoulder 25 engaging the inner end of the inner race 26.

The housing 16 has an externally reduced diameter at the end thereof inwhich the bearing 18 is mounted to permit attachment of a protectionguard (not shown) thereto.

A circular base plate 27 is mounted on the reduced extension 24 of thestub shaft 22 and has a reduced diameter extension 28 which projectsthrough the threaded ring 21 and engages the inner race 26 of thebearing 18 on a side thereof opposite the shoulder 25.

A circular cap plate 29 is `also mounted on the reduced extension 24 o-fthe stub shaft 22 outwardly of the base plate 27 but in contacttherewith. The reduced extension 24 of the stub shaft 22 is threaded at30 at its outer end and a nut 31 threaded thereon clamps the cap plate29 against the base plate 27 and through the reduced diameter extension28 and the inner race 26 against the shoulder 25 so that the cap plate29 and base plate 27 revolve with ythe shaft 22 upon operation of theelectric motor 11. A key (not shown) engages between the shaft 22 andthe plates 27, 29 to secure them against turning on the shaft 22. Thecap plate 29 has a beveled face 32 on the side thereof opposite the baseplate 27. A plurality of semi-conical sockets 33 are formed inequi-spaced relation through the cap plate 29 opening through thebeveled face 32 thereof. The axis of the semi-conical sockets 33 extendsgenerally perpendicularly to the beveled face 32 of the cap plate 29 anddecrease in diameter toward the base plate 27. The base plate 27 and thecap plate 29 `are provided with a plurality of semi-spherical sockets 34opening into both the base plate 27 and the cap plate 29 at the bottomof each of the semi-conical sockets 33 and communicating therewith.

A hammer shaft 3S h-as -a spherical head 36 on its inner end seated inthe spherical socket 34 with the shaft 35 extending through .thesemi-conical socket 33. The conical sockets 33 opening into the beveledsurface 32 lirrrit the shafts 35 to the desired swing. The shaft 35 hasa reduced diameter threaded extension 37 on its outer end and isprovided with an externally toothed hammer 38 threadably engagedthereon. The spread of the hammers 38 on operation of the sealer 10 islimited by ythe limitation of the shafts 35.

In the use and operation of the invention, the motor 11 is held in thehand and operated by the trigger switch 13 so that the base plate `andcap plate 27, 29 are rotated `at a suitable speed in the neighorhood of3000 r.p.m. The construction of the base plate 27 and cap plate 29 withthe semi-spherical sockets 34 arranged in close proximity to the shaft22 produces a scaling device in which vibration is reduced to a minimumand the power required is substantially less than that of the ilexibleshaft operated units of the prior art devices.

Having thus described the preferred embodiment of the invention, itshould be understood that numerous structural modifications andadaptations may be resorted to without departing from the scope of theappended claims.

What is claimed is:

l. A rotary scaling device comprising a portable electric motorincluding a gear box at one end thereof, a cylindrical housingdetachably secured to the gear box end of said motor, a spindleprojecting from the gear box end of said motor into said housing, a stubshaft journalled Lfor rotation in said housing and secured to saidspindle for rotation thereby, a base plate mounted "rality ,of hammershafts,r ay'sphericallzuaal` formedfpn pfco'ncalsolcfkets*limit the:spreadof sadhammer shafts f 'each'fof said hammer Shafts and.mcriunel`in. `said spheri iriaL positin with their extending-substantially'peri`mer heads ,are pfolvidedwith @plurality of egtemal'iea'hrylindriealhfmsing4 `mppming said snub Shaft in said cylindpalhoushlgdmj Totation therein. n f l VQ No referencs waited.y

